$ dpkg -l | grep gstreamer1.0-gtk3 ii gstreamer1.0-gtk3:amd64 1.20.1-1ubuntu1 amd64 GStreamer plugin for GTK+3
$ dpkg -l | grep gstreamer1.0-gtk3 0-gtk3: amd64 1.20.1-1ubuntu1 amd64 GStreamer plugin for GTK+3
ii gstreamer1.